Braking apparatus for vehicle

Abstract

A braking apparatus for a vehicle is disclosed herein. According to an embodiment of the present disclosure, a braking apparatus for a vehicle is provided, the apparatus including: a front wheel braking unit configured to brake a front wheel of the vehicle; a rear wheel braking unit configured to brake a rear wheel of the vehicle using an electro-mechanical brake; a main control unit configured to control the front wheel braking unit using hydraulic pressure and to transfer a braking command to the rear wheel braking unit; and an auxiliary control unit configured to enable redundancy control of the rear wheel braking unit, wherein the front wheel braking unit further comprises at least one electronic parking brake caliper disposed on the front wheel, and wherein the electronic parking brake caliper is connected to the auxiliary control unit and controlled by the redundancy control unit.

What is claimed is: 
     
         1 . A braking apparatus for a vehicle, comprising:
 a front wheel braking unit configured to receive hydraulic pressure from an electric booster via a hydraulic line to and to generate a braking force to brake a front wheel of the vehicle based on the hydraulic pressure;   a rear wheel braking unit configured to brake a rear wheel of the vehicle using an electro-mechanical brake;   a main control unit configured to control the front wheel braking unit cause the electric booster to supply the hydraulic pressure to the front wheel braking unit via the hydraulic line and to transfer a braking command to the rear wheel braking unit; and   an auxiliary control unit configured to enable redundancy control of the rear wheel braking unit,   wherein the front wheel braking unit further comprises at least one electronic parking brake caliper disposed on the front wheel,   wherein the electronic parking brake caliper is connected to the auxiliary control unit and controlled by the auxiliary control unit, and   wherein the auxiliary control unit performs backup braking to prevent wheel lock on the rear wheels by limiting the braking force generated hydraulically by the front wheel braking unit using the electronic parking brake caliper when the vehicle performs emergency braking.   
     
     
         2 . The braking apparatus of  claim 1 , wherein the braking apparatus further comprises a communication unit capable of transmitting and receiving a braking signal between the main control unit, the auxiliary control unit, and the rear wheel braking unit. 
     
     
         3 . The braking apparatus of  claim 2 , wherein the communication unit is duplexed into a first communication line and a second communication line to configure a communication redundancy system. 
     
     
         4 . The braking apparatus of  claim 3 , wherein the auxiliary control unit controls to implement a preset backup braking performance using the front wheel braking unit when an abnormality occurs in at least one of the first communication line and the second communication line. 
     
     
         5 . The braking apparatus of  claim 1 , further comprising a plurality of power supply units configured to supply power to at least one of the main control unit, the auxiliary control unit, and the rear wheel braking unit. 
     
     
         6 . The braking apparatus of  claim 5 , wherein the plurality of power supply units comprises:
 a first power supply unit configured to supply power to the main control unit; and   a second power supply unit configured to supply power to the auxiliary control unit and the rear wheel braking unit.   
     
     
         7 . The braking apparatus of  claim 6 , wherein the auxiliary control unit controls the front wheel braking unit by applying the power supplied from the second power supply unit to the electronic parking brake caliper when the vehicle performs emergency braking. 
     
     
         8 . The braking apparatus of  claim 6 , wherein, when an abnormality occurs in the main control unit and the first power supply unit, the auxiliary control unit applies power to the electronic parking brake caliper to brake the front wheel braking unit and transfers a braking signal to the rear wheel braking unit to control to implement a preset backup braking performance. 
     
     
         9 . The braking apparatus of  claim 1 , wherein, in a case when an anti-lock braking system (ABS) operation is determined to be required when emergency braking using the electronic parking brake caliper, the auxiliary control unit determines whether braking response of the front wheel braking unit is delayed and a braking performance of the vehicle is deteriorated. 
     
     
         10 . The braking apparatus of  claim 9 , wherein, when the braking performance of the vehicle is determined to be deteriorated, the auxiliary control unit limits braking force of the front wheel braking unit to a preset braking force. 
     
     
         11 . The braking apparatus of  claim 10 , wherein, when the braking force of the front wheel braking unit is limited to the preset braking force, the auxiliary control unit generates as much braking force as the preset braking force for the rear wheel braking unit and controls to implement a preset backup braking performance using the braking force of the front wheel braking unit and the rear wheel braking unit.